Jar ram and other molding machine



Feb. 3. 1925.

c. MARSHALL JAR RAM AND OTHER MOLDINKG MACHINE 9 2 Sheets-Sheet l Filed Feb.

Illu'l/ r I Il 1,524,991 C. MARSHALL JAR RAM AND-OTHER MoLDING MACHINE Filed Feb. 1. 1923 2 sheets-Sheet 2 Feb. 3. 192s.

Fatented Feb. 3, 1925.

UNTED STATES PATENT OFFICE.

CHARLES MARSHALL, OF LEEDS, ENGLAND, ASSIGNOR TO JOSEPH CASH, F TIPTON, STAFFORD, ENGLAND.

JAR RAM AND OTHER MOLDING MACHINE.

Application led February 1, 1923. Serial No. 616,412.

To all whom it may concer/n:

Be it known that CHARLES MARSHALL, a subject of the King of Great Britain, residing at 32 1Woodsley Road, Leeds, in the county of York, England, has invented a new and useful Improvement in or Relating to Jar Ram and Other Molding Machines; and he does hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to jar ram molding machines where sand or other material. is rammed in a box or flask around a pattern or into a core box, both of which are used f in casting metals.

The object of this invention is to produce a simple and inexpensive portable machine which may be operated by hand for packing the sand or other material around the pattern and for raising the box or flask olii' the pattern.

The Vinvention consists of a jar ram molding machine adapted for reciprocal manual operation by means of a lever or other de vice, wherein the molding table is resiliently supported by a spring or springs which effect or aid the return movement of the table. The invention also resides in the improved construction 'a-nd arrangement of parts constituting the machine as will be hereinafter more fully described.

The preferred'construction of the presen invention will now be described with particular reference to the accompanying sheet of drawings, but the invention is not limited to the details of construction and arrange- Ymentshown thereby as considerable departures may be made within the scope ofthe claims appended to this specification.

Fig. 1 is a part sectional side elevation of the molding machine.

Fig. 2 is aaplan ofthe machine.

Fig. 3 illustrates ay means for maintaining the molding box or flask in a raised position, and A Fig. 1 is a plan of Fig. 3.

According to the illustrated construction of this invention and referring first more particularly to Figs.l 1 and 2, on'a bed plate 5 is cast a pillar 6 having a flange 7 near its upper end, the pillar 6 is of tubular construction and has its upper portion formed with a cylindrical aperture adapted to receive the cylindrical vertical plunger or ram 8 which carries the table 9. The table 9 is either cast on or fixed to the upper end of the plunger or ram and the plunger or ram is formed with a central cylindrical aperture 82", and a slotted bottom section 8b. On the outside of the pillar' 6 and to the one side thereof are formed two pairs of brackets 10 and 11 the brackets 11 being disposed on either side of a vertical slot 12 formed in the one side of the pillar 6. Through this slot is passed a lever 13 for intermittently lifting the plunger or ram mounted on a spindle 14 carried by the lower pair of brackets 11 and the outer projecting end of the said lever is pivotally connected by a link 15 bifurcated at each end to the projecting end of a `lever 16 fixed upon a spindle 17 mounted in the upper pair of brackets 10. The inner end of the lever 11 is arranged to pass into a slot 8c in the plunger Y8 and to be pivotally connected by means of a link 18 which is bifurcated at the lower end to the plunger or ram 8 the connexion being made by means of the pin 19 fixed in the cylinder or ram 8. Mounted on the spindle 17 is the operating hand lever 20 which is curved to the required shape and bifurcated at its outer and free end to re- Aceive a transverse bar 21 mounted upon a spindle which forms a handlel for operating purposes. The inner end of the lever 2O is cranked inwards as seen in Fig.` 2 and the cranked end of the lever is provided with a central hole for loosely mounting the lever upon a flanged boss 22 which is fixed to the spindle 17. The cranked end of the lever is retained in position on the spindle 17 by means of the collar 23.

In the flange of the boss 22 are provided notches 22a with which the inner end of a sliding circular rod 24 carried by the said lever is adapted to engage, the outer end v of the said rod isv pivotally connected to a hand lever 25 which is fulorumed by means of the pin 26 on the lever 20. In its normal position the inner end of the rod is in engagement with one of the notches 22a in the anged boss. This rod 24 forms the means of connection for the hand lever 20 vwith the spindle 17 and determines (according to the notch 22a in the flanged boss 22 with which it is in engagement) the angular position of the lever 20 to the spindle 17, and also serves to maintain the lever 2O in its lowest position when desire-d as will be here inafter described.

8. This lever isv To the lever 16 is secured a transverse pin 26 which projects on both sides of the lever 16 and to t-his pin are connected tvvo spiral springs 27 which are connected at their lower ends to a treadle lever 23 by means of the transverse pin'fixed thereon. rlhis treadle lever is fulcrumed at its inner end by means of the pin 30 to the base of the pillar 6. The treadle lever is arranged to engage any one of aI series of not-ches or teeth 31 formed on a guide bar 32. The guide bar is fixed to thel bed plate 5, the said treadle and notches or teeth serving to effect an adjustment or variation of the tension of the springs 27 as required.

The plunger or ram 3 is raised by a verticalspiral spring 33 carried Within the pillar 6. The spring is retained in position by projections 34 and 35 respectively attached or formed on the bottom 8b of the plunger S and the upper face of the bed plate 5. lhen the table is in its lowest position the spring` 33 Will be compressed and as soon as the opera-ting handle 20 is raised the spring Will assist in raising the plunger or ram for jolting or other purposes.

To maintain. the hand lever 20 in its position the rod 24 is engaged with the notch in the fian'ed boss designated 22a in Fig. 1, to effect t is engagement the boss 22 has --to be slightly rotated anti-clockwise and thereby through the lever 16 link 15 and lever 13 positions the link 18 on the opposite side of the vertical centre-line passing through theV pin 26 to that seen in Fig. 1, and thereby the pressure exerted by the spring 33 tends to hold the lever 20 in its lowest position when released.

For the Ipurpose of maintaining the molding box or flask in a raised position above the table Q-When required a mechanism as illustrated in Figs. 3 and 4t may be employed but this invention is not limited to the particular means illustrated as considerable variations may be made in the construction of this part of the mechanism or it may be dispensed With altogether. The boX or flask 36 is carried by means of four vert-ical arms 37 eachv formed with a ste-p at the top end tio receive the flange of the upper section of t-he boX or flask 36. The arms 37 are secured by means of set screws 38 to lbrackets 39 p-ivotally mounted as pairs on the tivo horizontal rotatable rods l() loosely mounted in brackets 41 secured to extensions of the flange 7 of the pillar 6. Secured to the one end of the pair of rods 10 are cranks 42 and 43 which are pivotally connected to rods 411 and lo respectively, the rods .in turn being pivotally connected to a tivo-armed lever 46 which is fulcrumed lby Vmeans of a bolt 417 on the pillar 6. It lwill be clear that in the event of a rocking action being imparted to the tivo-armed 'le-ver .46 say by means of the flynut 48 that the four arms 37 are rocked with the pair of spindles 40 and the arms can be caused to occupy the vertical position seen in Fig. 3, or can be moved outwardly so as to free the box or flask 37 and admit of it being supported upon the table 9 in readiness for the jarring orI olting ra-mming operation.

ln some cases the operating lever, shafting and lever connections are dispensed With Y in small machines, and when this is done the table is pressed doivn by hand for im parting thereto the `required jolting mot-ion, and in order to assist the spring in raising the table it may be slightly lifted by the hand of the operator. The supporting le'- vers and parts connected therewith for hold-y ing the box or fia-sk in a raised position during the descent of the table would still be used.

lilo-lding machines constructed as herein described can be easily operated by hand, and after the liask or boX has been rammed sufficiently by moving the jarring or j'olting lever up and down the hinged supporting arms can be raised as described for lifting the boX or fiask and holding it in position during the descent of the table and the pattern or model of the article to be cast that has been used. After the pattern has been removed from the box or flask the supports are again lowered to the-ir normal position and the plate or table is then ready for the reception of another flask.

Claims 1. fr ar ram moldingl machine comprising in combination a base, a table adapted for vertical reciprocation, pivotal linkage in connexion With said table, a shaft, a hand lever mounted on said shaft and pivotally connected to said linkage for vedecting reciprocal motion of the table, a spring con nected to said level' and a spring disposed below said table for Wholly or substantially offsetting the Weight of the said table and any load thereon.

2. A j ar ram molding machine comprising in combination a base, a table adapted for vertical reciprocation, pivotal linkage in connexion with said table, a shaft, a hand lever mounted on said shaft and pivotally connected to said linkage for effecting reciprocal motion of the table, a spring connected to said lever, means for varying the tension of said spring, and a spring disposed below said table for wholly or substantially offsetting the Weight of said table and any load thereon.

3. A ram molding machine comprising in combination a base, a hollow pillar, a table adapted for vertical reciprocation, a stem connected to said table, pivotal linkage connected to said stem,y a spring controlled hand lever pivotally mounted on a shaft and pivotally connected to said linkage for effecting motion of thepsaid table, a spring Yli) disposed below said table for wholly or substantially offsetting the Weight of the said table and any load thereon, and means for determining the angular motion of the said lever.

4. A jar ram molding machine comprising in combination a base, a hollow pillar, a table adapted for vertical reciprocation, a stem connected to said table, pivotal linkage connected to said stem, a hand lever pivotally mounted on a shaft and pivotally connected to said linkage for eiecting motion of the said table, a spring connected to said hand lever, a treadle connected to said spring, means for varying the tension of the said spring, and a spring disposed below said table for Wholly or substantially Oifsetting the weight of the said table and any load thereon.

5. A jar ram molding machine comprising in combination a base, a hollow pillar, a table adapted for vertical reciprocation, a stem connected to said table, pivotal linkage connected to said stem, a hand lever pivotally mounted on a shaft and pivotally connected to said linkage for ellecting motion of the said table, a spring connected to said hand lever, a treadle connected to said spring, means for varying the tension of the said spring, a spring disposed below said table for wholly or substantially offsetting the weight of the said table and any load thereon, and means for maintaining the molding box in a raised position above the molding table.

In testimony whereof, I have signed my name to this specification.

CHARLES MARSHALL, 

